Re: [PATCH 28/43] xfs: hide reserved RT blocks from statfs

Darrick J. Wong
2025-02-07T04:32:35Z

On Thu, Feb 06, 2025 at 07:44:44AM +0100, Christoph Hellwig wrote:
> File systems with a zoned RT device have a large number of reserved
> blocks that are required for garbage collection, and which can't be
> filled with user data. Exclude them from the available blocks reported
> through stat(v)fs.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> fs/xfs/xfs_super.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 5c1e01e92814..34b0f5a80412 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -869,7 +869,8 @@ xfs_statfs_rt(
> {
> st->f_bfree = xfs_rtbxlen_to_blen(mp,
> xfs_sum_freecounter(mp, XC_FREE_RTEXTENTS));
> - st->f_blocks = mp->m_sb.sb_rblocks;
> + st->f_blocks = mp->m_sb.sb_rblocks -
> + xfs_rtbxlen_to_blen(mp, mp->m_resblks[XC_FREE_RTEXTENTS].total);

Makes sense,
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> }
>
> static void
> --
> 2.45.2
>
>